"Gunsmoke" et al

• Spaghetti westerns
• Movie genre named for a food staple
• John Wayne productions
• Many old B films
• Movies often with shootouts
• Old Westerns
• Tom Mix vehicles
• Some of their scenes were filmed in deserts
• "The Marshal of Cripple Creek" and others

Wiktionary Word definitions in Wiktionary
n. (plural of oater English).